Enhancement: Pure offline backup option

[joshbmarshall]

To reduce the space on the server, make it optional to have the borg repositories on another server, accessible by ssh
@ramirojoaquin I will work on this and create a pull request

[AndrewBarber]

@joshbmarshall using your PR, what needs to change in the config(?) to make the backup pure to offline? Trying to look at the diff but there is quite a lot of changes. Thanks ahead, this is exactly what I want to try and do 👍

[joshbmarshall]

@AndrewBarber the config changes are minimal:

BORG_SERVER=
BORG_SERVER_PORT=22
BORG_SERVER_USER=borg
BORG_SERVER_DIR=/data/hostname

Just make sure you have set up ssh keys and can log in from the command line to/from the user
Any issues with it reply here and I'll help you out